Initial source

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diff --git a/kern/time_stamp.h b/kern/time_stamp.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+#ifndef	_KERN_TIME_STAMP_H_
+#define _KERN_TIME_STAMP_H_
+
+#include <machine/time_stamp.h>
+/*
+ *	time_stamp.h -- definitions for low-overhead timestamps.
+ */
+
+struct tsval {
+	unsigned	low_val;	/* least significant word */
+	unsigned	high_val;	/* most significant word */
+};
+
+/*
+ *	Format definitions.
+ */
+
+#ifndef	TS_FORMAT
+/*
+ *	Default case - Just return a tick count for machines that
+ *	don't support or haven't implemented this.  Assume 100Hz ticks.
+ *
+ *	low_val - Always 0.
+ *	high_val - tick count.
+ */
+#define	TS_FORMAT	1
+
+#if	KERNEL 
+unsigned	ts_tick_count;
+#endif	KERNEL
+#endif	TS_FORMAT
+
+/*
+ *	List of all format definitions for convert_ts_to_tv.
+ */
+
+#define	TS_FORMAT_DEFAULT	1
+#define TS_FORMAT_MMAX		2
+#endif	_KERN_TIME_STAMP_H_